I just got in a second Coppi Steel C.F. in a size 52 with the exact same colors as the size 56. Guess what, it is heavier . Only by 15 grams, but still. I guess that if you would like to build a lightweight steel frame, having enough tubing to chose from is a big bonus seeing as apparently not every piece has the same weight.

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My Renovo R1 wooden bike project and the reason for my passion for all that is wood.

Check it out: the most amazing vintage Colnago, Merckx and Pinarello collection

If only Foco still existed. Mind you, I'm pretty sure that Spirit is foco with different tube shapes and butting. I may be wrong though. I love the look of Coppi frames. Always great lines and just enough flash to be noticed, but not over the top. Is it all steel or half steel, half carbon? My Cinelli spirit was no pig, but the carbon rear end helped bring down the weight.

The Coppi was 100% steel.

I thought that Foco is now Life and Ultrafoco now Spirit. That is why I was so surprised that the Coppi Foco frame weighed less than anything I have seen before.

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My Renovo R1 wooden bike project and the reason for my passion for all that is wood.

Check it out: the most amazing vintage Colnago, Merckx and Pinarello collection

Looking for a steel replacement for my caad9. So far I'm looking at the rodrezuez outlaw frame. He can build a full steel frame at around 1.3kg. Not bad at all. Who else is building weenie steel? English was on the top of my list but he is 2 years out on the next spot. A lot of builders offer a S3/Columbus blend build but all seem to come in around 1.6kg.

If you want a steel frame that handles and rides great and lasts too, you should not put weight as the top priority. There is a reason why most "light" steel frame come in around 1600g.

I believe Rrnolds 953 is a stainless tube set that I have heard is significantly lighter than any of the "steel" tubesets including 853.

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For certain parts stiffer is more important than lighter.

To a certain extent, it depends how much a builder is willing to trade durability (also against dents, crashes, etc) for weight. Black Cat Bicyles for example is offering lighter tubing options for road bikes, and has been doing steel with a (non-obvious) carbon fiber top+seat tube (somewhat similar to what Rob English has been doing). Also they look the best. One may dream.

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Bikes: Raw Ti, 650b flatbar CX

as above, reynolds 953, or columbus xcr, allow lighter steel frames - weight for weight these are same/stronger than ti, the only downside is price

English's wait time ballooned from 1yr when I ordered mine to 2yrs now - it may be worth the wait, since he has won the best Campagnolo bike at NAHBS 2014.

Probably mentioned before and recommended by ww members: Meech, Tonic, Dornbox

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Less is more.

Jaegher makes Colombus Xcr frames they claim are around 1400 gms (Ascender: http://jaegher.com/Lh7V6Ir). They also build niobium frames called Interceptor (http://jaegher.com/LaosIJR) Don't know about waiting times etc but maybe worth a call/mail.

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Bianchi EV3, Master Olympic, Pinarello Asolo

I put my deposit down in August and my delivery date isn't until December 2015

It's worth the wait, mate! Very nice Christmas present

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Less is more.

After looking and looking going to go with mosaic. The RS-1. They say f/f/h weigh in under 4lbs. $3100 PF30bb, internal rear brake, enve 1.0, king headset, spectrum paint. Goal is 15lbs.

1,800g

My humble sharing. An early 90's Ciocc made from Genius tubing. Genius was one of the last old school tube set before Columbus started introducing the modern and current series such as the Xcr, Spirit etc. Claim to be around 1,600g for a medium size frame in differential shape triple butted with wall thickness as low as 0.4mm in select areas.

If you prefer old school steel frame, perhaps consider to look out for Columbus Genius, EL or Nemo tubing. They were mostly made in the early 90's around the time when carbon tubing start becoming the norm.

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Colnago C59 KOM
Colnago Extreme-C KOM
Ciocc Aquila Genius tubing
Colnago Master Olympic